Five kHz thermometry in turbulent spray flames using chirped-probe-pulse femtosecond CARS, part II: Structure of reaction zones

2019 ◽  
Vol 200 ◽  
pp. 417-432 ◽  
Author(s):  
Albyn Lowe ◽  
Levi M. Thomas ◽  
Aman Satija ◽  
Robert P. Lucht ◽  
Assaad R. Masri
Keyword(s):  
Probe Pulse ◽  
Spray Flames ◽  
Reaction Zones ◽  
Turbulent Spray

scholarly journals Chirped-probe-pulse femtosecond CARS thermometry in turbulent spray flames

2019 ◽  
Vol 37 (2) ◽  
pp. 1383-1391 ◽  
Author(s):  
A. Lowe ◽  
L.M. Thomas ◽  
A. Satija ◽  
R.P. Lucht ◽  
A.R. Masri
Keyword(s):  
Probe Pulse ◽  
Spray Flames ◽  
Turbulent Spray

Five kHz thermometry in turbulent spray flames using chirped-probe pulse femtosecond CARS, part I: Processing and interference analysis

2019 ◽  
Vol 200 ◽  
pp. 405-416 ◽  
Author(s):  
Levi M. Thomas ◽  
Albyn Lowe ◽  
Aman Satija ◽  
Assaad R. Masri ◽  
Robert P. Lucht
Keyword(s):  
Probe Pulse ◽  
Interference Analysis ◽  
Spray Flames ◽  
Turbulent Spray

scholarly journals Turbulent Combustion Modelling and Experiments: Recent Trends and Developments

2019 ◽  
Vol 103 (4) ◽  
pp. 847-869 ◽  
Author(s):  
A. Giusti ◽  
E. Mastorakos
Keyword(s):  
Turbulent Combustion ◽  
Mixture Fraction ◽  
Moment Closure ◽  
Combustion Model ◽  
Complex Geometries ◽  
Conditional Moment ◽  
Practical Applications ◽  
Spray Flames ◽  
Reaction Zones ◽  
Soot Emissions

AbstractThe development of better laser-based experimental methods and the fast rise in computer power has created an unprecedented shift in turbulent combustion research. The range of species and quantities measured and the advent of kHz-level planar diagnostics are now providing great insights in important phenomena and applications such as local and global extinction, pollutants, and spray combustion that were hitherto unavailable. In simulations, the shift to LES allows better representation of the turbulent flow in complex geometries, but despite the fact that the grid size is smaller than in RANS, the push towards realistic conditions and the need to include more detailed chemistry that includes very fast species and thin reaction zones emphasize the necessity of a sub-grid turbulent combustion model. The paper discusses examples from current research with experiments and modelling that focus on flame transients (self-excited oscillations, local extinction), sprays, soot emissions, and on practical applications. These demonstrate how current models are being validated by experimental data and the concerted efforts the community is taking to promote the modelling tools to industry. In addition, the various coordinated International Workshops on non-premixed, premixed, and spray flames, and on soot are discussed and some of their target flames are explored. These comprise flames that are relatively simple to describe from a fluid mechanics perspective but contain difficult-to-model combustion problems such as extinction, pollutants and multi-mode reaction zones. Recently, swirl spray flames, which are more representative of industrial devices, have been added to the target flames. Typically, good agreement is found with LES and some combustion models such as the progress variable - mixture fraction flamelet model, the Conditional Moment Closure, and the Transported PDF method, but predicting soot emissions and the condition of complete extinction in complex geometries is still elusive.

Spray Flame Study Using a Model Gas Turbine Swirl Burner

2013 ◽  
Vol 316-317 ◽  
pp. 17-22 ◽  
Author(s):  
Cheng Tung Chong ◽  
Simone Hochgreb
Keyword(s):  
Flow Field ◽  
Gas Turbine ◽  
Flame Structure ◽  
Fuel Droplets ◽  
Spray Flame ◽  
Spray Flames ◽  
Reaction Zones ◽  
Fixed Power ◽  
Particle Imaging ◽  
Gas Turbine Burner

A model gas turbine burner was employed to investigate spray flames established under globally lean, continuous, swirling conditions. Two types of fuel were used to generate liquid spray flames: palm biodiesel and Jet-A1. The main swirling air flow was preheated to 350 °C prior to mixing with airblast-atomized fuel droplets at atmospheric pressure. The global flame structure of flame and flow field were investigated at the fixed power output of 6 kW. Flame chemiluminescence imaging technique was employed to investigate the flame reaction zones, while particle imaging velocimetry (PIV) was utilized to measure the flow field within the combustor. The flow fields of both flames are almost identical despite some differences in the flame reaction zones.

scholarly journals Nanoparticle Formation and Behavior in Turbulent Spray Flames Investigated by DNS

2020 ◽  
Vol 105 (2) ◽  
pp. 497-516 ◽  
Author(s):  
Abouelmagd Abdelsamie ◽  
Frank Einar Kruis ◽  
Hartmut Wiggers ◽  
Dominique Thévenin
Keyword(s):  
Nanoparticle Formation ◽  
Spray Flames ◽  
Turbulent Spray ◽  
And Behavior
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